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Saturation, Relaxation, and Dissociation of Excited Triplet Excitons in Conjugated Polymers
Author(s) -
Yang Xudong,
Lee ChangLyoul,
Westenhoff Sebastian,
Zhang Xinping,
Greenham Neil C.
Publication year - 2009
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200802597
Subject(s) - excited state , materials science , exciton , femtosecond , saturation (graph theory) , polymer , conjugated system , dissociation (chemistry) , excitation , spectroscopy , ultrafast laser spectroscopy , relaxation (psychology) , molecular physics , photochemistry , atomic physics , chemical physics , chemistry , laser , optics , condensed matter physics , physics , mathematics , combinatorics , composite material , psychology , social psychology , quantum mechanics
Femtosecond pump‐probe spectroscopy is used to measure the excited state absorption dynamics in triplet excitons generated by continuous wave excitation of a conjugated polymer. Saturation of the T 1 – T n transition is observed, allowing a cross‐section of 2.0 × 10 −16 cm 2 to be established. Relaxation to T 1 occurs with a 300 fs timescale, but 20% of T n states dissociate into charges.